The calculated distance (air line) between Bochum-Hordel and Lünen is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Lünen is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Lünen has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles